Allowed domains are a restricted set of domain names that are allowed to add
load balancer nodes.

content caching

When content caching is enabled on a load balancer, recently-accessed files
are stored on the load balancer for easy retrieval by web clients. Requests to
the load balancer for these files are serviced by the load balancer itself,
which reduces load off its back-end nodes and improves response times as well.

health monitor

The load balancing service includes a health monitoring operation which
periodically checks your back-end nodes to ensure they are responding
correctly. If a node is not responding, it is removed from rotation until the
health monitor determines that the node is functional. In addition to being
performed periodically, the health check also is performed against every node
that is added to ensure that the node is operating properly before allowing it
to service traffic. Only one health monitor is allowed to be enabled on a load
balancer at a time.

load balancer

A load balancer is a device that distributes incoming network
traffic amongst multiple back-end systems. These back-end systems are
called the nodes of the load balancer.

metadata

Metadata can be associated with each load balancer and each node for the
client’s personal use. It is defined using key-value pairs where the key
and value consist of alphanumeric characters. A key is unique per load
balancer.

node

A node is a backend device that provides a service on specified IP and port.
An example of a load balancer node might be a web server serving HTTP
traffic on port 8080. A load balancer typically has multiple nodes attached
to it so it can distribute incoming network traffic amongst them.

session persistence

Session persistence is a feature of the load balancing service that forces
multiple requests, of the same protocol, from clients to be directed to the
same node. This is common with many web applications that do not inherently
share application state between back-end servers.

virtual IP

A virtual IP (VIP) makes a load balancer accessible by clients. The
load balancing service supports either a public VIP address
(PUBLIC), routable on the public Internet, or a ServiceNet VIP
address (SERVICENET), routable only within the region in which the
load balancer resides.